package com.wyp.java8;

import org.junit.Before;
import org.junit.Test;

import java.util.*;
import java.util.stream.Collectors;
import java.util.stream.Stream;


public class TestTransaction02 {

	List<Transaction> transactions = null;

	@Before
	public void before(){
		Trader raoul = new Trader("Raoul", "Cambridge");
		Trader mario = new Trader("Mario", "Milan");
		Trader alan = new Trader("Alan", "Cambridge");
		Trader brian = new Trader("Brian", "Cambridge");

		transactions = Arrays.asList(
				new Transaction(brian, 2011, 300),
				new Transaction(raoul, 2012, 1000),
				new Transaction(raoul, 2011, 400),
				new Transaction(mario, 2012, 710),
				new Transaction(mario, 2012, 700),
				new Transaction(alan, 2012, 950)
		);
	}

	//1. 找出2011年发生的所有交易， 并按交易额排序（从低到高）
	@Test
	public void test1(){

		transactions.stream().filter(t ->{return t.getYear()==2011;}).sorted((e1,e2)->{return Integer.compare(e1.getValue(),e2.getValue());}).forEach(System.out::println);
	}

	//2. 交易员都在哪些不同的城市工作过？
	@Test
	public void test2(){
		transactions.stream().map(e->{return e.getTrader().getCity();}).collect(Collectors.toSet()).forEach(System.out::println);
	}

	//3. 查找所有来自剑桥的交易员，并按姓名排序
	@Test
	public void test3(){
		transactions.stream().filter(e->{return e.getTrader().getCity().equals("Cambridge");}).map(e->{return e.getTrader();}).sorted((e1,e2)->{return e1.getName().compareTo(e2.getName());}).distinct().forEach(System.out::println);
	}

	//4. 返回所有交易员的姓名字符串，按字母顺序排序
	@Test
	public void test4(){
		transactions.stream().map(e->{return e.getTrader().getName();}).distinct().sorted((e1,e2)->{return e1.compareTo(e2);}).forEach(System.out::println);
	}

	//5. 有没有交易员是在米兰工作的？
	@Test
	public void test5(){
		System.out.println(transactions.stream().anyMatch(e -> {
			return e.getTrader().getCity().equals("Milan");
		}));
	}

	//6. 打印生活在剑桥的交易员的所有交易额
	@Test
	public void test6(){
		System.out.println(transactions.stream().filter(e -> {
			return e.getTrader().getCity().equals("Cambridge");
		}).collect(Collectors.summarizingInt(e -> {
			return e.getValue();
		})).getSum());
	}


	//7. 所有交易中，最高的交易额是多少
	@Test
	public void test7(){
		System.out.println(transactions.stream().collect(Collectors.summarizingInt(e -> {
			return e.getValue();
		})).getMax());
	}

	//8. 找到交易额最小的交易
	@Test
	public void test8(){
		System.out.println(transactions.stream().sorted((e1, e2) -> {
			return Integer.compare(e1.getValue(), e2.getValue());
		}).findFirst());
	}
}